Subject: [mg125115] Re: Why the FourierTransform gives two different answers?

From: Bill Rowe <readnews at sbcglobal.net>

Date: Wed, 22 Feb 2012 05:31:10 -0500 (EST)

Delivered-to: l-mathgroup@mail-archive0.wolfram.com

On 2/21/12 at 6:17 AM, avderov at gmail.com wrote:
>Why the FourierTransform gives two different answers?
>In[1] FourierTransform[ (t - 5.0)^2*Exp[-(t - 5.0)^2 ], t, w]
>In[2] FourierTransform[ (t - 5)^2* Exp[-(t - 5)^2 ], t, w]
For input 1 you are using machine precision arithmetic and are
subject to the limitations of your hardware. This is the nature
of using machine precision arithmetic.
For input 2 you are using exact arithmetic.